Apparatus for magnetic separation of materials



Dec. 13, 1932. G. ULLRICH ,8

APPARATUS FOR MAGNETIC SEPARATION OF MATERIALS Filed Jan. 2, 1929 atented Deca 13, 1932 UNITED STATES GBUSONWERK AKTIENG T,

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APPARATUS FOR KAGITETIO SEPARATION OF MATERIALS Application filed January 2, 1929, Serial No.

This invention relates to apparatus for the magnetic separation of materials. Magnetic separators are known in which a rotating separator drum is mounted between two magnet poles; up to now, however, of the two external magnetic fields obtained by such a construction, only one has been utilized forseparation purposes, whilst the electric energy spent on the generation of the second external field remained unutilized.

According to the present invention, in magnetic separatorsin which an armature is provided between two ma net poles, two or more external magnetic fie ds t us produced are used for separation urposes and an apparatus is provided which makes possible such utilization. Owing to this, with the same e1:- penditure of energy a double output is obtained, or it the separation is repeated in the second magnetic field, a substantially cleaner separated product results.

@ne form of separating apparatus suit able for carrying outthe process is diagrammatically illustrated by way of example in the accompanying drawing.

in the construction shown in the drawing, between two magnet poles 1 and 2 arranged one above the other, which can be staggered relatively to each other in the lateral direction, is mounted a drum 3. The upper magnetpole 1 is displaced relatively to the drum 3 to such an extent that it is possible to introduce the material between the magnet pole and the drum. The material drops from a hopper 4 over a chute 5 into the upper field gap where the magnetic ingredients are held fast by the drum 3, the non-magnetic ingredients sliding over the drum to a discharge plate 6. In the neutral zone indicated by the line 7, the magnetic ingredients, as well as any non-magnetic ingredients enclosed by them, fall from the drum 3 on to a shaking table, chute or the like 8 which is arranged in the lower field gap and conveys the material through it for the purpose of additional separation. The lower pole could be arranged in such a position laterally of the armature that it would be approximately under 0 the upper pole 1 that the material which drops off in the neutral zone would fall ,di-

329,814, and in Germany January 5, 1928.

rectly on its separating surface or on a chute situated on the latter; the separating surface is then arranged obliquely. In the lower field gap, the magnetic ingredients are attracted upwards by the drum 3 and thrown behind a discharge plate 9, the non-magnetic or weakly magnetic ingredients falling ed in front of this discharge plate. The extraction of the magnetic ingredients in the lower field gap ensures a. thoroughly good separation.

The charging device could be shaken in a well-known manner, for instance by means of the drum drive, In order to avoid the formation of eddy currents in the drums, the latter could be built up from plates, rings or wires of magnetizable material insulated from one another. I

hat 1 claim is: p

1. An apparatus for'tlie magnetic separation of materials comprising two magnet poles, an armature drum arranged between said poles, means for feeding material onto said drum adjacent one side of one of said poles, means adj acent the other side of said pole for separating the materialdischarged from said drum from the material retained on said drum, said retained material being subsequently discharged from said drum, and means for causing said last-mentioned discharged material to pass through the magnetic field formed between said drum and said second pole to effect a secondary separation.

2. In an apparatus for the magnetic separation of materials a pair of pole faces, an

armature drum between said pole faces, means for obtalnlng a separation of the material in the field of each pole face, said pole faces being displaced from a vertical line with respect to one another whereby the neutral magnetic Zone in the armature drum is displaced from a horizontal position.

3. An apparatus for the magnetic separation of materials comprising two magnet poles staggered relatively to one another with respect to the vertical direction, an armature drum arranged between said poles, means for feeding material onto said drum adjacent one side of one of said poles, means adjacent the other side of said pole for seplid outing the matorialdischarged from said drum from the material retained on said drum, and means-for causing the material retained on said drum beyond said second 5 named means to pass through the field of said secondpole.

The foregoing specification signed at Berlin this 18th day of December, 1928.

GEORG ULLRICH. 

